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EP3451562B1 - Procédé de mesurage d'indicateur de qualité de canal (cqi), et dispositif et système de communication sans fil - Google Patents

Procédé de mesurage d'indicateur de qualité de canal (cqi), et dispositif et système de communication sans fil Download PDF

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Publication number
EP3451562B1
EP3451562B1 EP17805518.2A EP17805518A EP3451562B1 EP 3451562 B1 EP3451562 B1 EP 3451562B1 EP 17805518 A EP17805518 A EP 17805518A EP 3451562 B1 EP3451562 B1 EP 3451562B1
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EP
European Patent Office
Prior art keywords
cqi measurement
resource
measured
base station
downlink cqi
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EP17805518.2A
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German (de)
English (en)
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EP3451562A4 (fr
EP3451562A1 (fr
Inventor
Hao Tang
Zhengwei Gong
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of EP3451562A4 publication Critical patent/EP3451562A4/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • This application relates to the communications field, and in particular, to a channel quality indicator (channel quality indicator, CQI) measurement method, an apparatus, and a wireless communications system.
  • a channel quality indicator channel quality indicator, CQI
  • a base station In a Long Term Evolution (long term evolution, LTE) or Long Term Evolution Advanced (long term evolution advanced, LTE-A) network, a base station usually serves user equipment (user equipment, UE) in a frequency division duplexing (frequency division duplexing, FDD) or time division duplexing (time division duplexing, TDD) mode.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • two UEs for example, UE 1 and UE 2 that use a same frequency band within a same time may cause interference to each other. For example, uplink data sent by the UE 1 to the base station may interfere with downlink data sent by the base station to the UE 2.
  • the base station may place UEs with weak mutual interference into one UE group, and UEs in a same group may use a same frequency band within a same time or may use a same time on a same frequency band.
  • UEs in different groups cannot use a same frequency band within a same time, or use a same time on a same frequency band.
  • the base station may usually select a proper resource, a proper modulation and coding scheme, and a proper transmission mode for UE based on a downlink CQI measured and reported by the UE.
  • a frequently used downlink CQI measurement method is: UE measures average channel quality on an entire downlink system bandwidth to obtain a downlink CQI of the entire system bandwidth, and then the UE reports the downlink CQI to the base station.
  • an uplink signal sent by the UE 1 to the base station may interfere with a downlink signal sent by the base station to the UE 2. Therefore, to eliminate the interference, the base station may place the UE 1 and the UE 2 into different UE groups, but when measuring a downlink CQI, the UE 2 still treats the uplink signal sent by the UE 1 to the base station as an interference signal to the downlink signal sent by the base station to the UE 2. Consequently, the downlink CQI measured by the UE 2 is inaccurate.
  • LG Electronics CSI feedback for low complexity UEs (R1-155372) discusses the design of channel state information, CSI, feedback for Rel-13 machine type communication, MTC, UEs. Particularly, the document discusses some issues about wideband/subband CSI feedback mechanisms including feedback mode and CQI computation considering the reduced bandwidth and also coverage enhancements.
  • WO 2016/072784 provides a channel state information measurement method, including: receiving, by a UE, resource indication information for a CSI measurement; performing, by the UE, the CSI measurement according to the resource indication information, and transmitting a channel quality indicator, CQI, report to a control node.
  • a channel state information measurement method including: receiving, by a UE, resource indication information for a CSI measurement; performing, by the UE, the CSI measurement according to the resource indication information, and transmitting a channel quality indicator, CQI, report to a control node.
  • CQI channel quality indicator
  • Embodiments of the present invention provide a CQI measurement method, an apparatus, and a wireless communications system, to improve accuracy of downlink CQI measurement performed by UE.
  • an embodiment of the present invention provides a CQI measurement method according to claim 1.
  • an embodiment of the present invention provides a base station according to claim 10.
  • an embodiment of the present invention provides a computer-readable storage medium according to claim 14.
  • a and/or B may represent the following three cases: Only A exists, both A and B exist, and only B exists.
  • the character "/" in this specification generally indicates an "or" relationship between the associated objects.
  • A/B may be understood as "A or B".
  • first the terms “first”, “second”, and so on are intended to distinguish between different objects, but are not intended to indicate a particular order of the objects.
  • first UE, second UE, and the like are intended to distinguish different UEs, but are not intended to indicate a particular order of the UEs.
  • a plurality of in the following embodiments of this application means “two or more than two".
  • a plurality of base stations means two or more than two base stations.
  • a plurality of and “at least two” may convey a same meaning, and both may mean “two or more than two" and are interchangeable.
  • a process, a method, a system, a product, or a device that includes a series of steps or units is not limited to the listed steps or units, but optionally may further include other unlisted steps or units, or optionally further include another inherent step or unit of the process, the method, the product, or the device.
  • a base station needs to determine channel quality of a downlink channel between the base station and the UE when sending, the UE, the downlink signal (meaning a signal sent by the base station to the UE).
  • the UE may measure the downlink channel to obtain a downlink CQI, and send the downlink CQI to the base station, so that the base station determines the channel quality of the downlink channel based on the downlink CQI.
  • the base station may allocate, to the UE, a new channel of better channel quality (for example, the channel quality is greater than or equal to the preset channel quality threshold), to transmit the downlink signal to the UE.
  • a new channel of better channel quality for example, the channel quality is greater than or equal to the preset channel quality threshold
  • the UE can measure average channel quality of an entire downlink system bandwidth when performing downlink CQI measurement, to obtain a downlink CQI of the entire system bandwidth.
  • the UE may receive interference from uplink signals of other surrounding UEs (meaning signals sent by the another UEs to the base station) during downlink signal transmission. Therefore, to avoid this interference, among UEs served by the base station, the base station may place UEs with no or relatively weak mutual interference (for example, interference between any two UEs is less than a preset interference threshold) into one UE group, and place UEs with relatively strong mutual interference (for example, interference between any two UEs is greater than or equal to the preset interference threshold) into different UE groups. Therefore, UEs in one group cause no interference or relatively weak interference to each other, and UEs in different groups cause relatively strong interference to each other. UEs in one group can use a same frequency band within a same time or use a same time on a same frequency band. UEs in different groups cannot use a same frequency band within a same time, or use a same time on a same frequency band.
  • UEs that use a same frequency band within a same time or use a same time on a same frequency band can be kept from interfering with each other.
  • one UE still treats an uplink signal of another UE not in a same group as the UE, as an interference signal to a downlink signal of the UE. Consequently, a downlink CQI measured by the UE is inaccurate.
  • the base station may indicate, to the UE, a downlink CQI measurement resource for use by the UE to perform downlink CQI measurement.
  • a downlink CQI measurement resource indicated by the base station to the first UE is a resource in a system resource other than an uplink resource for second UE.
  • Both the first UE and the second UE are served by a same base station, and the first UE and the second UE belong to different UE groups, meaning that the second UE is UE causing relatively strong interference to the first UE.
  • the first UE does not perform downlink CQI measurement on the uplink resource for the second UE when performing downlink CQI measurement on the downlink CQI measurement resource indicated by the base station, the first UE does not treat an uplink signal sent by the second UE to the base station as an interference signal to a downlink signal sent by the base station to the first UE. In this way, accuracy of downlink CQI measurement performed by the first UE can be improved.
  • the system resource means all resources allocatable by the base station.
  • the resource includes a time domain resource and a frequency domain resource.
  • the frequency domain resource may be an entire system bandwidth of the base station.
  • the CQI measurement method provided in the embodiments of the present invention may be applied to a wireless communications system.
  • the wireless communications system may include one or more base stations and UE served by the base station or base stations.
  • FIG. 1 is a schematic architecture diagram of a possible wireless communications system according to an embodiment of the present invention.
  • a base station and UE complete downlink CQI measurement by using the CQI measurement method provided in the embodiments of the present invention.
  • the base station determines a downlink CQI measurement resource for first UE, and sends resource indication information to the first UE to indicate the downlink CQI measurement resource to the first UE, so that the first UE can perform downlink CQI measurement on the downlink CQI measurement resource.
  • the base station has indicated, to the first UE, the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement, and a bandwidth of a frequency domain resource included in the downlink CQI measurement resource is less than a system bandwidth. Therefore, the first UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement on the downlink CQI measurement resource.
  • the first UE when performing downlink CQI measurement, does not treat an uplink signal sent by another UE, for example, second UE, to the base station as an interference signal to a downlink signal sent by the base station to the first UE, thereby improving accuracy of downlink CQI measurement performed by the first UE.
  • another UE for example, second UE
  • the base station may work in a full-duplex mode. That is, the base station may perform two-way signal transmission simultaneously. For example, the base station may simultaneously send a downlink signal to the first UE and receive an uplink signal sent by the second UE.
  • the UE may work in a half-duplex mode. That is, the UE may transmit an uplink signal or receive a downlink signal, but cannot transmit an uplink signal and receive a downlink signal simultaneously. For example, the UE may transmit an uplink signal within a first time, and receive a downlink signal within a second time, but cannot transmit an uplink signal and receive a downlink signal simultaneously within the first time or the second time.
  • the base station may serve UE in an FDD mode or serve UE in a TDD mode, and no specific limitation is imposed thereon in this embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a possible interactive cooperation mode between a base station and first UE according to an embodiment of the present invention.
  • the following describes the CQI measurement method, an apparatus, and a system that are provided in the embodiments of the present invention based on FIG. 2 by using examples.
  • a base station may include a determining unit 10, a sending unit 11, and a receiving unit 12, and first UE may include a receiving unit 20, a measurement unit 21, and a sending unit 22.
  • the determining unit 10 of the base station After the determining unit 10 of the base station determines a downlink CQI measurement resource, where the downlink CQI measurement resource is for use by the first UE to perform downlink CQI measurement, the determining unit 10 of the base station sends the downlink CQI measurement resource to the sending unit 11 of the base station; the sending unit 11 of the base station sends, to the first UE, resource indication information used to indicate the downlink CQI measurement resource; after the receiving unit 20 of the first UE receives the resource indication information, the receiving unit 20 of the first UE sends the resource indication information to the measurement unit 21 of the first UE; the measurement unit 21 of the first UE performs downlink CQI measurement on the downlink CQI measurement resource indicated by the resource indication information, and the measurement unit 21 of the first UE sends a downlink CQI measurement result of downlink CQI measurement performed by the measurement unit 21 of the first UE to the sending unit 22 of the first UE; and the sending unit 22 of the first UE
  • the determining unit 10 of the base station determines a downlink CQI measurement resource once at an interval of a fixed time period, and within the fixed time period, the measurement unit 21 of the first UE performs downlink CQI measurement based on a downlink CQI measurement resource indicated by resource indication information within the fixed time period.
  • the base station only needs to indicate a downlink CQI measurement resource to the first UE once within a fixed time period, thereby reducing air interface overheads between the base station and the first UE.
  • the downlink CQI measurement resource determined by the base station, the resource indication information sent by the base station, and the downlink CQI measurement result received by the base station may be stored in a storage unit 13 of the base station.
  • the resource indication information and the downlink CQI measurement resource that are received by the first UE and the result of downlink CQI measurement performed by the first UE may be stored in a storage unit 23 of the first UE.
  • unit/module division of the base station and the UE and method procedures performed by units/modules of the base station and the UE, are detailed in the following apparatus embodiments, and details are not described for now.
  • the wireless communications system provided in the embodiment of the present invention may be a Universal Mobile Telecommunications System (universal mobile telecommunications system, UMTS), a Code Division Multiple Access (code division multiple access, CDMA) system, a wireless local area network (wireless local area network, WLAN), a communications system using a 5th generation mobile communications (the 5th generation mobile communication, 5G) technology, or the like.
  • Universal Mobile Telecommunications System universal mobile telecommunications system, UMTS
  • CDMA Code Division Multiple Access
  • WLAN wireless local area network
  • 5G 5th generation mobile communication
  • the base station may be a distributed base station, a cloud random access network (cloud RAN, CRAN) device, an access network device that includes a radio access network controller and a base station, or the like.
  • the distributed base station or the CRAN device may include a base band unit (base band unit, BBU) and a remote radio unit (remote radio unit, RRU).
  • BBU base band unit
  • RRU remote radio unit
  • the CRAN device may be further a CRAN device with flexible layering of protocols.
  • the CRAN device with flexible layering of protocols specifically includes an enhanced BBU and an enhanced RRU, and the enhanced BBU and the enhanced RRU may both have some or all of wireless protocol layers.
  • the wireless protocol layers include a Packet Data Convergence Protocol (packet data convergence protocol, PDCP) layer, a Radio Link Control (radio link control, RLC) layer, a Media Access Control (media access control, MAC) layer, and a physical layer (physical layer, PHY), and the RRU further includes a radio frequency (radio frequency, RF) part.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Media Access Control
  • PHY physical layer
  • RF radio frequency
  • the UE may be a wireless terminal.
  • the wireless terminal may be a device that provides voice and/or data connectivity for a user, a handheld device having a wireless connection function, or another processing device connected to a wireless modem.
  • the wireless terminal may communicate with one or more core networks by using a radio access network (Radio Access Network, RAN).
  • the wireless terminal may be a mobile terminal, such as a mobile phone (or referred to as a "cellular" phone), or a computer provided with a mobile terminal, for example, a portable, pocket-sized, handheld, computer built-in, or in-vehicle mobile apparatus that exchanges voice and/or data with the radio access network.
  • the wireless terminal may be, for example, a personal communications service (personal communication service, PCS) phone, a cordless phone, a Session Initiation Protocol (session initiation protocol, SIP) phone set, a wireless local loop (wireless local loop, WLL) station, or a personal digital assistant (personal digital assistant, PDA).
  • PCS personal communication service
  • WLL wireless local loop
  • PDA personal digital assistant
  • the wireless terminal may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a mobile (mobile), a remote station (remote station), an access point (access point), a remote terminal (remote terminal), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), user equipment (User Equipment), or the like.
  • an embodiment of the present invention provides a CQI measurement method. As shown in FIG. 3 , the CQI measurement method may include the following steps.
  • a base station determines a downlink CQI measurement resource, where the downlink CQI measurement resource is for use by first UE to perform downlink CQI measurement.
  • the downlink CQI measurement resource includes a frequency domain resource, and a bandwidth of the frequency domain resource is less than a system bandwidth.
  • the downlink CQI measurement resource is a resource in a system resource other than an uplink resource for second UE, both the first UE and the second UE are served by a same base station, and the first UE and the second UE belong to different UE groups. Therefore, the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth (to be specific, is a bandwidth in the system bandwidth other than a bandwidth for the uplink resource for the second UE).
  • the base station may serve a plurality of UEs.
  • the plurality of UEs include the first UE and the second UE.
  • the CQI measurement method in the embodiments of the present invention is described by using interaction between one of the plurality of UEs, that is, the first UE, and the base station as an example.
  • the second UE is UE that causes relatively strong interference to the first UE.
  • the uplink resource for the second UE includes a time domain resource and a frequency domain resource. Therefore, to ensure that the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement is other than the uplink resource for the second UE, the downlink CQI measurement resource may be a frequency domain resource, or may be a time domain resource and a frequency domain resource. Specifically, detailed descriptions are to be provided in the following embodiments, and omitted for now.
  • the base station sends resource indication information to the first UE, where the resource indication information is used to indicate the downlink CQI measurement resource.
  • the first UE receives the resource indication information from the base station.
  • the first UE performs downlink CQI measurement on the downlink CQI resource indicated by the resource indication information.
  • the base station can determine the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement, and the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth. Therefore, the first UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement on the downlink CQI measurement resource.
  • the UE when performing downlink CQI measurement, the UE does not treat an uplink signal sent by another UE to the base station as an interference signal to a downlink signal sent by the base station to the first UE, thereby improving accuracy of downlink CQI measurement performed by the first UE.
  • the accuracy of downlink CQI measurement performed by the first UE can be improved, it can be ensured that the base station performs more accurate downlink channel quality estimation, facilitating allocation of a proper downlink resource to the first UE.
  • specific implementation of the downlink CQI measurement resource may be one of the following.
  • the resource indication information used to indicate the downlink CQI measurement resource includes m subband number sets, m start subframe numbers, and m subframes.
  • each subband number set includes a number of at least one to-be-measured subband in one set of to-be-measured subbands
  • the one set of to-be-measured subbands is one of the m sets of to-be-measured subbands.
  • the radio frame may include 10 subframes. Each subframe is 1 millisecond. 10 subframes in one radio frame may be a subframe 0, a subframe 1, and a subframe 9.
  • the start subframe number is a number of a 1 st subframe with which the first UE can start downlink CQI measurement
  • the subframe quantity is a quantity of continuous subframes in which the first UE can perform downlink CQI measurement.
  • the downlink CQI measurement resource includes two sets of to-be-measured subbands and two to-be-measured time windows corresponding to the two sets of to-be-measured subbands, that each set of to-be-measured subbands includes three to-be-measured subbands, and that each to-be-measured time window includes three subframes.
  • Three subbands in one set of to-be-measured subbands are a to-be-measured subband 1, a to-be-measured subband 2, and a to-be-measured subband 3, three subframes of a to-be-measured time window corresponding to the set of to-be-measured subbands are a subframe 0, a subframe 1, and a subframe 2, three to-be-measured subbands in another set of to-be-measured subbands are the to-be-measured subband 3, a to-be-measured subband 4, and a to-be-measured subband 5, and three subframes of a to-be-measured time window corresponding to this set of to-be-measured subbands are a subframe 4, a subframe 5, and a subframe 6.
  • the resource indication information may be expressed by ⁇ 1,2,3 ⁇ ;0,3; ⁇ 3,4,5 ⁇ ;4,3 ⁇ .
  • ⁇ 1,2,3 ⁇ ;0,3 ⁇ indicates the one set of to-be-measured subbands and the to-be-measured time window corresponding to this set of to-be-measured subbands
  • ⁇ 3,4,5 ⁇ ;4,3 ⁇ indicates the another set of to-be-measured subbands and the to-be-measured time window corresponding to this set of to-be-measured subbands.
  • ⁇ 1,2,3 ⁇ ;0,3 ⁇ , ⁇ 1,2,3 ⁇ represents a subband number set of the one set of to-be-measured subbands, to be specific, is used to indicate the to-be-measured subband 1, the to-be-measured subband 2, and the to-be-measured subband 3;
  • 0 represents a start subframe number (that is, starting with the subframe 0) of the to-be-measured time window corresponding to this set of to-be-measured subbands;
  • 3 represents a subframe quantity of to-be-measured subframes in the to-be-measured time windows (that is, starting with the subframe 0, the first UE performs downlink CQI measurement on three continuous subframes: the subframe 0, the subframe 1, and the subframe 2).
  • ⁇ 3,4,5 ⁇ represents a subband number set of the another set of to-be-measured subbands, to be specific, used to indicate the to-be-measured subband 3, the to-be-measured subband 4, and the to-be-measured subband 5;
  • 4 represents a subframe number (that is, starting with the subframe 4) of the to-be-measured time window corresponding to the set of to-be-measured subbands;
  • 3 represents a subframe quantity of to-be-measured subframes in the to-be-measured time windows (that is, starting with the subframe 4, the first UE performs downlink CQI measurement on three continuous subframes: the subframe 4, the subframe 5, and the subframe 6).
  • the quantity of sets of to-be-measured subbands, the quantity of to-be-measured subbands included in the set of to-be-measured subbands, the quantity of to-be-measured time windows, and the quantity of to-be-measured subframes included in the to-be-measured time window are merely an example, and do not limit this embodiment of the present invention in any sense. Specifically, the quantities may be determined depending on actual use requirements, and are not specifically limited in this embodiment of the present invention.
  • the downlink CQI measurement resource indicated to the first UE by the base station is a resource in the system resource other than the uplink resource for the second UE (for example, a frequency domain resource that can be used by the UE to perform downlink CQI measurement, or a time domain resource and a frequency domain resource that can be used by the UE to perform downlink CQI measurement).
  • the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement has excluded an uplink resource occupied by an uplink signal from the second UE that interferes with a downlink signal of the first UE. Therefore, when performing downlink CQI measurement, the first UE does not treat the uplink signal from the second UE as an interference signal to the downlink signal of the first UE, thereby improving accuracy of downlink CQI measurement performed by the first UE.
  • S104 may specifically include: S104a.
  • the first UE performs downlink CQI measurement on the downlink CQI measurement resource within a first time period.
  • the first time period may be a cycle for the first UE to report the downlink CQI measurement result to the base station, that is, a CQI reporting cycle; or the first time period may be a time period from a subframe in which the base station sends a downlink CQI measurement instruction to the first UE, to a subframe in which the first UE reports the downlink CQI measurement result to the base station.
  • the downlink CQI measurement instruction may be a CQI report request message.
  • the following embodiments and accompanying drawings are all described by using an example in which the downlink CQI measurement instruction is a CQI report request message.
  • the CQI measurement method may further include S105 to S107.
  • the first UE sends, to the base station, a downlink CQI measurement result of downlink CQI measurement performed by the first UE.
  • the downlink CQI measurement result may include a first CQI value measured by the first UE on the downlink CQI measurement resource.
  • the downlink CQI measurement result may include a first CQI value measured by the first UE on the downlink CQI measurement resource and a first offset value.
  • the first offset value is used to indicate a difference between a second CQI value of a subband measured by the first UE and the first CQI value.
  • the first UE may usually measure a plurality of subbands. Therefore, there are also a plurality of second CQI values for the subbands measured by the first UE, and there are also a plurality of first offset values. Each first offset value is used to indicate a difference between a second CQI value of a subband measured by the first UE and the first CQI value.
  • the first UE needs to measure second CQI values of three subbands: a CQI 1 of a subband 1, a CQI 2 of a subband 2, and a CQI 3 of a subband 3.
  • first offset values there are three first offset values: an offset value 1 corresponding to the CQI 1, an offset value 2 corresponding to the CQI 2, and an offset value 3 corresponding to the CQI 3.
  • the offset value 1 is used to indicate a difference between the CQI 1 and the first CQI value
  • the offset value 2 is used to indicate a difference between the CQI 2 and the first CQI value
  • the offset value 3 is used to indicate a difference between the CQI 3 and the first CQI value.
  • the downlink CQI measurement result sent by the first UE to the base station may include the first CQI value, or the downlink CQI measurement result may include the first CQI value, the offset value 1, the offset value 2, and the offset value 3.
  • the base station may learn, based on the downlink CQI measurement result, of average channel quality of the downlink CQI measurement resource.
  • the base station may learn, based on the downlink CQI measurement result, of average channel quality of the downlink CQI measurement resource and channel quality of the subbands 1, 2, and 3.
  • an LTE standard has specified three manners for the first UE to send the downlink CQI measurement result to the base station (that is, the three manners may be used in S105 to send the downlink CQI measurement result to the base station): reporting a wideband CQI, reporting a CQI of a subband selected by the first UE, and reporting a CQI of a subband indicated by the base station.
  • the wideband CQI in this embodiment of the present invention is a CQI measured by the first UE on the downlink CQI measurement resource indicated by the base station (that is, all resources in the system resource other than the uplink resource for the second UE).
  • This CQI may be used to indicate average channel quality of the downlink CQI measurement resource.
  • the downlink CQI measurement result sent by the first UE to the base station includes the first CQI value measured by the first UE on the downlink CQI measurement resource.
  • the downlink CQI measurement result sent by the first UE to the base station includes the first CQI value measured by the first UE on the downlink CQI measurement resource and the first offset value (the first offset value is a difference between a CQI value of the subband that is selected by the first UE and measured by the first UE and the first CQI value, or the first offset value is a difference between the CQI value of the subband that is indicated by the base station and measured by the first UE and the first CQI value).
  • subbands that need to be measured by the first UE are selected by the first UE; corresponding to the manner of reporting the CQI of the subband indicated by the base station, subbands that need to be measured by the first UE are indicated to the first UE by the base station.
  • the base station may send subband numbers of these subbands to the first UE, so as to indicate the subbands to the first UE.
  • the first offset value 00 may be used to indicate a case in which the difference is less than or equal to 1; the first offset value 01 may be used to indicate a case in which the difference is equal to 2; the first offset value 10 may be used to indicate a case in which the difference is equal to 3; and the first offset value 11 may be used to indicate a case in which the difference is greater than or equal to 4.
  • Table 1 First offset value corresponding to a subband selected by the first UE Difference between a second CQI value and the first CQI value 00 ⁇ 1 01 2 10 3 11 ⁇ 4
  • the first UE indicates, to the base station by using these two bits (that is, the first offset value), channel quality of the subband measured by the first UE. This can reduce air interface overheads between the first UE and the base station.
  • the base station After receiving the first offset values and the first CQI value from the first UE, the base station can learn of average channel quality of the downlink CQI measurement resource based on the first CQI value and learn, based on the first offset values, of the channel quality of the subbands corresponding to the first offset values. In this way, a proper downlink resource is allocated to the first UE based on the average channel quality of the downlink CQI measurement resource and the channel quality of these subbands.
  • One or more subbands may be selected by the first UE.
  • the selection may specifically depend on an actual use requirement, and is not specifically limited in this embodiment of the present invention.
  • the first offset value 00 may be used to indicate a case in which the difference is equal to 0; the first offset value 01 may be used to indicate a case in which the difference is equal to 1; the first offset value 10 may be used to indicate a case in which the difference is greater than or equal to 2; and the first offset value 11 may be used to indicate a case in which the difference is less than or equal to -1.
  • Table 2 First offset value corresponding to a subband indicated to the first UE by the base station Difference between a second CQI value and the first CQI value 00 0 01 1 10 ⁇ 2 11 ⁇ -1
  • the first UE indicates, to the base station by using these two bits (that is, the first offset value), channel quality of the subbands measured by the first UE. This can reduce air interface overheads between the first UE and the base station.
  • the base station After receiving the first offset values and the first CQI value from the first UE, the base station can learn of average channel quality of the downlink CQI measurement resource based on the first CQI value and learn, based on the first offset values, of the channel quality of the subbands corresponding to the first offset values. In this way, a proper downlink resource is allocated to the first UE based on the average channel quality of the downlink CQI measurement resource and the channel quality of these subbands.
  • One or more subbands may be indicated to the first UE by the base station.
  • the selection may specifically depend on an actual use requirement, and is not specifically limited in this embodiment of the present invention.
  • first offset values in Table 1 and Table 2 are merely examples for description, and do not limit this embodiment of the present invention in any sense. How the first offset value is expressed may specifically depend on an actual circumstance. For example, the first offset value may be expressed by using more bits. This is not limited in this embodiment of the present invention.
  • S106. The base station receives the downlink CQI measurement result from the first UE.
  • S107. The base station determines channel quality of a downlink channel between the base station and the first UE based on the downlink CQI measurement result.
  • the base station when the downlink CQI measurement result sent by the first UE to the base station includes the first CQI value, after the base station receives the downlink CQI measurement result, for example, if the base station determines that average channel quality of the downlink CQI measurement resource is less than a preset channel quality threshold, the base station may indicate to the first UE that sending of the downlink signal is suspended, or instruct the first UE to make a cell handover, a base station change, or the like.
  • the base station may continue to use the current channel (the channel between the base station and the first UE) to send the downlink signal to the first UE.
  • the base station may indicate, to the first UE, that sending of the downlink signal is suspended, or instruct the first UE to make a cell handover, a base station change, or the like; or if the base station determines that average channel quality of the downlink CQI measurement resource is less than a preset channel quality threshold, and the base station determines that channel quality of some of subbands corresponding to the first offset values is greater than or equal to the preset channel quality threshold, the base station may select these subbands to send the downlink signal to the first UE.
  • the base station may preferentially select these subbands to send the downlink signal to the first UE; or if the base station determines that average channel quality of the downlink CQI measurement resource is greater than or equal to the preset channel quality threshold, and the base station determines that channel quality of subbands corresponding to the first offset values is less than the preset channel quality threshold, the base station may continue to use the current channel (the channel between the base station and the first UE) to send the downlink signal to the first UE.
  • the manner in which the first UE sends the downlink CQI measurement result to the base station may be periodic sending or non-periodic sending. If the manner in which the first UE sends the downlink CQI measurement result to the base station is periodic sending, S104 is also performed periodically. In this case, a time between sending of two consecutive downlink CQI measurement results to the base station by the first UE is referred to as one CQI reporting cycle, that is, the first time period. If the manner in which the first UE sends the downlink CQI measurement result to the base station is non-periodic sending, S104 is also performed non-periodically.
  • a time period from a subframe in which the base station sends a downlink CQI measurement instruction to the first UE to a subframe in which the first UE reports the downlink CQI measurement result to the base station is referred to as a time of one CQI reporting, that is, the first time period.
  • a time of one CQI reporting that is, the first time period.
  • the first UE periodically sends the downlink CQI measurement result to the base station.
  • the first UE needs to perform downlink CQI measurement periodically. In this case, the first UE needs to perform downlink CQI measurement once within each CQI reporting cycle.
  • the base station may indicate the downlink CQI measurement resource to the first UE only once.
  • the base station does not need to indicate the downlink CQI measurement resource to the first UE repeatedly.
  • the first UE performs downlink CQI measurement on the downlink CQI measurement resource indicated by the base station, until the base station indicates a next downlink CQI measurement resource to the first UE.
  • the base station indicates, to the first UE, no time domain resource for use by the first UE to perform downlink CQI measurement, and the first UE needs to send, within each CQI reporting cycle, a downlink CQI measurement result of downlink CQI measurement performed by the first UE. Therefore, the time domain resource for use by the first UE to perform downlink CQI measurement may be any one or more subframes within each CQI reporting cycle.
  • the downlink CQI measurement resource may be one set of to-be-measured subbands, and a bandwidth occupied by this set of to-be-measured subbands is less than a system bandwidth.
  • this set of to-be-measured subbands includes a subband in the system bandwidth other than a subband occupied by an uplink resource for the second UE.
  • the first UE may perform downlink CQI measurement in any subframe within each CQI reporting cycle, and sends a downlink CQI measurement result of downlink CQI measurement performed by the first UE to the base station at a CQI reporting time point (for example, a time point at which a CQI reporting cycle ends).
  • a CQI reporting time point for example, a time point at which a CQI reporting cycle ends.
  • one CQI reporting cycle is between A and B (two CQI reportings), and a downlink CQI measurement resource indicated by the resource indication information, to be specific, one set of to-be-measured subbands, is between C and D.
  • This set of to-be-measured subbands includes at least one to-be-measured subband.
  • the resource indication information includes numbers of all subbands located between C and D, and these numbers are used to indicate that the first UE performs downlink CQI measurement on all the subbands located between C and D.
  • the first UE in any one or more subframes within each CQI reporting cycle, can perform downlink CQI measurement on a to-be-measured subband corresponding to the number of the at least one to-be-measured subband.
  • both the time domain resource and the frequency domain resource for use by the first UE to perform downlink CQI measurement are indicated by the resource indication information sent by the base station.
  • the downlink CQI measurement resource may be m sets of to-be-measured subbands and m to-be-measured time windows.
  • the m sets of to-be-measured subbands are in a one-to-one correspondence with the m to-be-measured time windows.
  • the m sets of to-be-measured subbands include a subband in the system bandwidth other than a subband occupied by an uplink resource for the second UE, and the m to-be-measured time windows include a subframe within the CQI reporting cycle other than a subframe occupied by the uplink resource for the second UE.
  • the first UE may perform downlink CQI measurement on the m sets of to-be-measured subbands, and send a downlink CQI measurement result of downlink CQI measurement performed by the first UE to the base station at a CQI reporting time point (for example, a time point at which a CQI reporting cycle ends).
  • a CQI reporting time point for example, a time point at which a CQI reporting cycle ends.
  • one CQI reporting cycle is between A and B (two CQI reportings); frequency domain resources of the downlink CQI measurement resource indicated by the resource indication information, to be specific, two set of to-be-measured subbands, are between C and D and between M and N, where each set of to-be-measured subbands includes at least one to-be-measured subband; and time domain resources of the downlink CQI measurement resource indicated by the resource indication information, to be specific, two to-be-measured time windows, are located between E and F and between J and K, where each to-be-measured time window includes a start subframe number and a subframe quantity corresponding to the start subframe number.
  • a set 1 of to-be-measured subbands is between C and D, and correspondingly a to-be-measured time window is between E and F; and a set 2 of to-be-measured subbands is between M and N, and correspondingly a to-be-measured time window 2 is between J and K.
  • the resource indication information sent by the base station to the first UE includes m subband number sets, m start subframe numbers, and m subframes. There is a one-to-one correspondence between the m subband number sets, the m start subframe numbers, and the m subframes.
  • the resource indication information includes numbers of all subframes located between E and F and correspondingly numbers of all subbands between C and D, and numbers of all subframes located between J and K and correspondingly numbers of all subbands between M and N. These numbers are used to indicate that the first UE performs downlink CQI measurement in any one or more subframes located between E and F and on all subbands between C and D, and performs downlink CQI measurement in any one or more subframes located between J and K and on all subbands between M and N.
  • this embodiment as shown in FIG.
  • the set 1 of to-be-measured subbands is between C and D, and correspondingly E is a start subframe number of the to-be-measured time window 1 and (F-E+1) is a quantity of subframes in the to-be-measured time window 1; the set 2 of to-be-measured subbands is between M and N, J is a start subframe number of a to-be-measured time window 2, and (K-J+1) is a quantity of subframes in the to-be-measured time window 2.
  • the first UE performs, in any one or more subframes of all to-be-measured subframes determined by each start subframe number and a subframe quantity corresponding to the start subframe number, downlink CQI measurement on a to-be-measured subband determined by a subband number set that is corresponding to the start subframe number and the subframe quantity.
  • the first UE non-periodically sends the downlink CQI measurement result to the base station.
  • the first UE needs to perform downlink CQI measurement non-periodically. In this case, the first UE performs downlink CQI measurement when the base station requests the first UE to report the downlink CQI measurement result.
  • the base station sends a CQI report request message to the first UE in a subframe N, that is, the first UE receives, in the subframe N, the CQI report request message sent by the base station, and that the base station requests the first UE to send the downlink CQI measurement result to the base station in a subframe N+4.
  • the time domain resource for use by the first UE to perform downlink CQI measurement may be any one or more subframes between the subframe N and the subframe N+4.
  • the downlink CQI measurement resource may be one set of to-be-measured subbands, and a bandwidth occupied by this set of to-be-measured subbands is less than a system bandwidth.
  • this set of to-be-measured subbands includes a subband in the system bandwidth other than a subband occupied by an uplink resource for the second UE.
  • the first UE may perform downlink CQI measurement in any one or more subframes of the subframe N, a subframe N+1, a subframe N+2, and a subframe N+3, and send, to the base station in the subframe N+4, the downlink CQI measurement result of downlink CQI measurement performed by the first UE.
  • a time of one CQI reporting is between A and B (between reception by the first UE of a CQI report request message sent by the base station and sending of a downlink CQI measurement result to the base station by the first UE).
  • the downlink CQI measurement resource indicated by the resource indication information is between C and D.
  • This set of to-be-measured subbands includes at least one to-be-measured subband.
  • the resource indication information includes numbers of all subbands located between C and D, and these numbers are used to indicate that the first UE performs downlink CQI measurement on all the subbands located between C and D.
  • the first UE can perform downlink CQI measurement on a to-be-measured subband corresponding to the number of the at least one to-be-measured subband.
  • both the time domain resource and the frequency domain resource for use by the first UE to perform downlink CQI measurement are indicated by the resource indication information sent by the base station.
  • the downlink CQI measurement resource may be m sets of to-be-measured subbands and m to-be-measured time windows.
  • the m sets of to-be-measured subbands are in a one-to-one correspondence with the m to-be-measured time windows.
  • the m sets of to-be-measured subbands include at least one to-be-measured subband, and the m to-be-measured time windows may be a set including any one or more subframes of the subframe N, the subframe N+1, the subframe N+2, and the subframe N+3.
  • the at least one to-be-measured subband includes a subband in the system bandwidth other than a subband occupied by an uplink resource for the second UE.
  • the m to-be-measured time windows include a subframe within the CQI reporting time other than a subframe occupied by the uplink resource for the second UE.
  • the first UE may perform downlink CQI measurement on all subbands determined by the m sets of to-be-measured subbands, and send, to the base station in the subframe N+4, the downlink CQI measurement result of downlink CQI measurement performed by the first UE.
  • a time of one CQI reporting is between A and B.
  • the resource indication information sent by the base station to the first UE includes m subband number sets, m start subframe numbers, and m subframes. There is a one-to-one correspondence between the m subband number sets, the m start subframe numbers, and the m subframes.
  • the resource indication information includes numbers of all subbands located between C and D and a start subframe number N and a subframe quantity 1 that are corresponding to these numbers, and numbers of all subbands between M and N and another start subframe number N+2 and a subframe quantity 1 that are corresponding to these numbers.
  • the numbers of all the subbands located between C and D and the start subframe number N and the subframe quantity 1 that are corresponding to these numbers, and the numbers of all the subbands between M and N and the start subframe number N+2 and the subframe quantity 1 that are corresponding to these numbers, are used to indicate that the first UE performs downlink CQI measurement on subbands corresponding to the numbers of all the subbands located between C and D in the subframe N and on subbands corresponding to the numbers of all the subbands located between M and N in the subframe N+2.
  • the first UE can perform downlink CQI measurement on a to-be-measured subband determined by a subband number set that is corresponding to the start subframe number and the subframe quantity.
  • the reporting the wideband CQI and the reporting the subband CQI of the subband selected by the first UE may be applied to not only a scenario in which the first UE periodically sends the downlink CQI measurement result to the base station, but also a scenario in which the first UE non-periodically sends the downlink CQI measurement result to the base station.
  • the reporting the subband CQI of the subband indicated by the base station may be applied to a scenario in which the first UE non-periodically sends the downlink CQI measurement result to the base station.
  • S102 may specifically include S102a or S102b: S102a.
  • the base station sends a radio resource control (radio resource control, RRC) message to the first UE, where the RRC message includes the resource indication information.
  • RRC radio resource control
  • the RRC message may be an RRC connection setup message, an RRC resource configuration message, an RRC resource reconfiguration message, or the like. No specific limitation is imposed thereon in this embodiment of the present invention. Specifically, in this embodiment of the present invention, the base station may add the resource indication information to one reserved field/some reserved fields of an existing RRC message, and send the reserved field/fields to the first UE.
  • the base station sends downlink control information (downlink control information, DCI) to the first UE, where the DCI includes the resource indication information.
  • DCI downlink control information
  • the base station may add the resource indication information to one reserved field/some reserved fields of existing DCI, and send the reserved field/fields to the first UE.
  • the base station sends the resource indication information to the first UE by using the RRC message or the DCI, without a need to add new message exchange to an interaction procedure between the base station and the first UE, thereby reducing air interface overheads between the base station and the first UE.
  • a new message may alternatively be defined.
  • the base station sends the resource indication information to the first UE by using the new message.
  • new message exchange needs to be added to an interaction procedure between the base station and the first UE, an existing RRC message or existing DCI does not need to be changed. Therefore, it is convenient to implement the CQI measurement method provided in this embodiment of the present invention.
  • S101 may specifically include: S101a.
  • the base station determines the downlink CQI measurement resource from a system resource based on an uplink resource allocated to second UE by the base station.
  • the UEs may request the base station to allocate resources for the UEs. For example, the first UE needs to receive a downlink signal, and the second UE needs to transmit an uplink signal. In this case, the base station allocates a downlink resource to the first UE, and allocates an uplink resource to the second UE. After the base station allocates the resources to the first UE and the second UE, because the second UE is UE that causes relatively strong interference to the first UE, when performing downlink CQI measurement, the first UE may treat an uplink signal of the second UE as an interference signal to a downlink signal of the first UE.
  • the base station may determine, from the system resource and based on the uplink resource allocated for the second UE by the base station, the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement.
  • the base station may determine a resource in the system resource other than the uplink resource for the second UE, as the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement, so as to ensure that the first UE is kept from being interfered with by the uplink signal of the second UE during downlink CQI measurement, thereby improving accuracy of downlink CQI measurement performed by the first UE.
  • an embodiment of the present invention provides a base station.
  • the base station is configured to perform steps performed by the base station in the foregoing method.
  • the base station may include modules corresponding to relevant steps.
  • the base station may include: a determining unit 10, configured to determine a downlink CQI measurement resource, where the downlink CQI measurement resource is for use by first UE to perform downlink CQI measurement, the downlink CQI measurement resource includes a frequency domain resource, and a bandwidth of the frequency domain resource is less than a system bandwidth; and a sending unit 11, configured to send resource indication information to the first UE, where the resource indication information is used to indicate the downlink CQI measurement resource determined by the determining unit 10.
  • the frequency domain resource includes one set of to-be-measured subbands, and the one set of to-be-measured subbands includes at least one to-be-measured subband.
  • the resource indication information includes a number of the at least one to-be-measured subband.
  • the downlink CQI measurement resource further includes a time domain resource
  • the frequency domain resource includes m sets of to-be-measured subbands
  • the time domain resource includes m to-be-measured time windows
  • the m sets of to-be-measured subbands are in a one-to-one correspondence with the m to-be-measured time windows
  • each set of to-be-measured subbands includes at least one to-be-measured subband
  • each to-be-measured time window includes at least one to-be-measured subframe, where m is an integer greater than or equal to 1.
  • the resource indication information includes m subband number sets, m start subframe numbers, and m subframes, there is a one-to-one correspondence between the m subband number sets, the m start subframe numbers, and the m subframes, each subband number set includes a number of at least one to-be-measured subband in one set of to-be-measured subbands, and the one set of to-be-measured subbands is one of the m sets of to-be-measured subbands.
  • the base station in this embodiment of the present invention may further include a receiving unit 12.
  • the receiving unit 12 is configured to: after the sending unit 11 sends the resource indication information to the first UE, receive a downlink CQI measurement result from the first UE.
  • the downlink CQI measurement result includes a first CQI value measured by the first UE on the downlink CQI measurement resource.
  • the downlink CQI measurement result further includes a first offset value, and the first offset value is used to indicate a difference between a second CQI value of a subband measured by the first UE and the first CQI value.
  • the sending unit 11 is specifically configured to send an RRC message or DCI to the first UE.
  • the RRC message or the DCI includes the resource indication information.
  • the determining unit 10 is specifically configured to determine the downlink CQI measurement resource from a system resource based on an uplink resource allocated to second UE by the base station.
  • the downlink CQI measurement resource is a resource in the system resource other than the uplink resource for the second UE, both the first UE and the second UE are served by the base station, and the first UE and the second UE belong to different UE groups.
  • the sending unit 11 and the receiving unit 12 may be implemented by using a transceiver; and the determining unit 10 may be implemented by using one or more processors.
  • the base station in this embodiment may correspond to the base station in the CQI measurement method in the embodiment in FIG. 3 or FIG. 4 , and the module division and/or functions of the modules of the base station in this embodiment are all intended to implement the method procedure shown in FIG. 3 or FIG. 4 . To avoid repetition, details are not described herein again.
  • the base station has indicated, to the first UE, the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement, and the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth. Therefore, the first UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement on the downlink CQI measurement resource.
  • the UE when performing downlink CQI measurement, the UE does not treat an uplink signal sent by another UE to the base station as an interference signal to a downlink signal sent by the base station to the first UE, thereby improving accuracy of downlink CQI measurement performed by the first UE.
  • an embodiment of the present invention provides UE.
  • the UE is configured to perform steps performed by the first UE in the foregoing method.
  • the UE may include modules corresponding to relevant steps.
  • the UE may include: a receiving unit 20, configured to receive resource indication information from a base station, where the resource indication information is used to indicate a downlink CQI measurement resource, the downlink CQI measurement resource includes a frequency domain resource, and a bandwidth of the frequency domain resource is less than a system bandwidth; and a measurement unit 21, configured to perform downlink CQI measurement on the downlink CQI measurement resource received by the receiving unit 20.
  • the frequency domain resource includes one set of to-be-measured subbands, and the one set of to-be-measured subbands includes at least one to-be-measured subband.
  • the measurement unit 21 is specifically configured to perform downlink CQI measurement on the at least one to-be-measured subband.
  • the resource indication information includes a number of the at least one to-be-measured subband.
  • the downlink CQI measurement resource further includes a time domain resource
  • the frequency domain resource includes m sets of to-be-measured subbands
  • the time domain resource includes m to-be-measured time windows
  • the m sets of to-be-measured subbands are in a one-to-one correspondence with the m to-be-measured time windows
  • each set of to-be-measured subbands includes at least one to-be-measured subband
  • each to-be-measured time window includes at least one to-be-measured subframe, where m is an integer greater than or equal to 1.
  • the measurement unit 21 is specifically configured to perform downlink CQI measurement on at least one to-be-measured subband in each set of to-be-measured subbands and in a to-be-measured time window corresponding to the set of to-be-measured subbands.
  • the resource indication information includes m subband number sets, m start subframe numbers, and m subframes, there is a one-to-one correspondence between the m subband number sets, the m start subframe numbers, and the m subframes, each subband number set includes a number of at least one to-be-measured subband in one set of to-be-measured subbands, and the one set of to-be-measured subbands is one of the m sets of to-be-measured subbands.
  • the UE in this embodiment of the present invention may further include a sending unit 22.
  • the sending unit 22 is configured to: after the measurement unit 21 performs downlink CQI measurement on the downlink CQI measurement resource, send a downlink CQI measurement result to the base station.
  • the downlink CQI measurement result includes a first CQI value measured by the measurement unit 21 on the downlink CQI measurement resource.
  • the downlink CQI measurement result further includes a first offset value, and the first offset value is used to indicate a difference between a second CQI value of a subband measured by the measurement unit 21 and the first CQI value.
  • the measurement unit 21 is specifically configured to perform downlink CQI measurement on the downlink CQI measurement resource within a first time period.
  • the first time period is a cycle for the UE to report the downlink CQI measurement result to the base station; or the first time period is from a subframe in which the base station sends a downlink CQI measurement instruction to the UE, to a subframe in which the UE reports the downlink CQI measurement result to the base station.
  • the receiving unit 20 is specifically configured to: receive an RRC message or DCI from the base station, where the RRC message or the DCI includes the resource indication information; and obtain the resource indication information based on the RRC message or the DCI.
  • the receiving unit 20 and the sending unit 22 may be implemented by using a transceiver; and the measurement unit 21 may be implemented by using one or more processors.
  • the UE in this embodiment may correspond to the UE in the CQI measurement method in the embodiment in FIG. 3 or FIG. 4 , and the module division and/or functions of the modules of the UE in this embodiment are all intended to implement the method procedure shown in FIG. 3 or FIG. 4 . To avoid repetition, details are not described herein again.
  • the UE can perform downlink CQI measurement on the downlink CQI measurement resource indicated by the resource indication information sent by the base station, and the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth. Therefore, it can be ensured that the UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement.
  • the UE when performing downlink CQI measurement, the UE does not treat an uplink signal sent by another UE to the base station as an interference signal to a downlink signal sent by the base station to the UE, thereby improving accuracy of downlink CQI measurement performed by the UE.
  • an embodiment of the present invention provides a base station.
  • the base station includes at least one processor 30, a transceiver 31, a memory 32, and a system bus 33.
  • the memory 32 is configured to store a computer executable instruction; the at least one processor 30, the memory 32, and the transceiver 31 are connected to each other by using the system bus 33; and when the base station runs, the at least one processor 30 executes the computer executable instruction stored in the memory 32, so that the base station performs the CQI measurement method shown in FIG. 3 or FIG. 4 .
  • the at least one processor 30 executes the computer executable instruction stored in the memory 32, so that the base station performs the CQI measurement method shown in FIG. 3 or FIG. 4 .
  • the specific CQI measurement method refer to related descriptions in the embodiment shown in FIG. 3 or FIG. 4 , and details are not described herein again.
  • the storage medium may include the memory 32.
  • the at least one processor 30 may be a central processing unit (central processing unit, CPU).
  • the at least one processor 30 may alternatively be another general-purpose processor, a digital signal processor (digital signal processing, DSP), an application-specific integrated circuit (application specific integrated circuit, ASIC), a field-programmable gate array (field-programmable gate array, FPGA) or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like.
  • the general-purpose processor may be a microprocessor, or the processor may be any normal processor, or the like.
  • the at least one processor 30 may be a dedicated processor.
  • the dedicated processor may include any one of a baseband processing chip, a radio frequency processing chip, or the like. Further, the dedicated processor may further include a chip provided with another terminal-specific processing function.
  • the memory 32 may include a volatile memory (volatile memory), for example, a random-access memory (random-access memory, RAM).
  • volatile memory volatile memory
  • RAM random-access memory
  • the memory 32 may alternatively include a non-volatile memory (non-volatile memory), for example, a read-only memory (read-only memory, ROM), a flash memory (flash memory), a hard disk drive (hard disk drive, HDD), or a solid-state drive (solid-state drive, SSD).
  • non-volatile memory for example, a read-only memory (read-only memory, ROM), a flash memory (flash memory), a hard disk drive (hard disk drive, HDD), or a solid-state drive (solid-state drive, SSD).
  • the memory 32 may include a combination of the foregoing types of memories.
  • the system bus 33 may include a data bus, a power bus, a control bus, a signal status bus, and the like. For clear description in this embodiment, various buses are marked as the system bus 33 in FIG. 13 .
  • the transceiver 31 may be a wireless transceiver.
  • the wireless transceiver may be an antenna or the like of the base station.
  • the at least one processor 30 receives data from and transmits data to another device, for example, UE, by using the transceiver 31.
  • the steps in the method procedure shown in FIG. 3 or FIG. 4 may be implemented by executing, by the processor 30 in a hardware form, the computer executable instruction in a software form stored in the memory 32. To avoid repetition, details are not described herein again.
  • An embodiment of the present invention provides a computer readable storage medium.
  • the computer readable storage medium stores one or more programs, the one or more programs include a computer executable instruction, and when at least one processor of a base station executes the computer executable instruction, the base station performs the CQI measurement method shown in FIG. 3 or FIG. 4 .
  • the base station has indicated, to the first UE, the downlink CQI measurement resource for use by the first UE to perform downlink CQI measurement, and the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth. Therefore, the first UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement on the downlink CQI measurement resource.
  • the UE when performing downlink CQI measurement, the UE does not treat an uplink signal sent by another UE to the base station as an interference signal to a downlink signal sent by the base station to the first UE, thereby improving accuracy of downlink CQI measurement performed by the first UE.
  • an embodiment of the present invention provides UE.
  • the UE includes at least one processor 40, a transceiver 41, a memory 42, and a system bus 43.
  • the memory 42 is configured to store a computer executable instruction; the at least one processor 40, the memory 42, and the transceiver 41 are connected to each other by using the system bus 43; and when the UE runs, the at least one processor 40 executes the computer executable instruction stored in the memory 42, so that the UE performs the CQI measurement method shown in FIG. 3 or FIG. 4 .
  • the at least one processor 40 executes the computer executable instruction stored in the memory 42, so that the UE performs the CQI measurement method shown in FIG. 3 or FIG. 4 .
  • CQI measurement method refer to related descriptions in the embodiment shown in FIG. 3 or FIG. 4 , and details are not described herein again.
  • the storage medium may include the memory 42.
  • the at least one processor 40 may be a CPU.
  • the at least one processor 40 may alternatively be another general-purpose processor, a DSP, an ASIC, an FPGA or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like.
  • the general-purpose processor may be a microprocessor, or the processor may be any normal processor, or the like.
  • the at least one processor 40 may be a dedicated processor.
  • the dedicated processor may include any one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may further include a chip provided with another terminal-specific processing function.
  • the memory 42 may include a volatile memory, for example, a random RAM.
  • the memory 42 may alternatively include a non-volatile memory, for example, a ROM, a flash memory, an HDD, or an SSD.
  • the memory 42 may alternatively include a combination of the foregoing types of memories.
  • the system bus 43 may include a data bus, a power bus, a control bus, a signal status bus, and the like. For clear description in this embodiment, various buses are marked as the system bus 43 in FIG. 14 .
  • the transceiver 41 may be a wireless transceiver.
  • the wireless transceiver may be an antenna or the like of the UE.
  • the at least one processor 40 receives data from and transmits data to another device, for example, a base station, by using the transceiver 41.
  • the steps in the method procedure shown in FIG. 3 or FIG. 4 may be implemented by executing, by the processor 40 in a hardware form, the computer executable instruction in a software form stored in the memory 42. To avoid repetition, details are not described herein again.
  • An embodiment of the present invention provides a computer readable storage medium.
  • the computer readable storage medium stores one or more programs, the one or more programs include a computer executable instruction, and when at least one processor of UE executes the computer executable instruction, the UE performs the CQI measurement method shown in FIG. 3 or FIG. 4 .
  • the UE can perform downlink CQI measurement on the downlink CQI measurement resource indicated by resource indication information sent by the base station, and the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth. Therefore, it can be ensured that the UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement.
  • the UE when performing downlink CQI measurement, the UE does not treat an uplink signal sent by another UE to the base station as an interference signal to a downlink signal sent by the base station to the UE, thereby improving accuracy of downlink CQI measurement performed by the UE.
  • An embodiment of the present invention provides a wireless communications system.
  • the wireless communications system includes a base station and UE.
  • the wireless communications system provided in this embodiment of the present invention may be the wireless communications system shown in FIG. 1 .
  • the base station performs the corresponding steps in the method procedure shown in FIG. 3 or FIG. 4 , to complete the CQI measurement method in the embodiments of the present invention.
  • the UE performs the corresponding steps in the method procedure shown in FIG. 3 or FIG. 4 , to complete the CQI measurement method in the embodiments of the present invention.
  • the wireless communications system includes the base station and the UE.
  • the base station can determine the downlink CQI measurement resource for use by the UE to perform downlink CQI measurement, and indicate the downlink CQI measurement resource to the UE by using the resource indication information, and the bandwidth of the frequency domain resource included in the downlink CQI measurement resource is less than the system bandwidth. Therefore, it can be ensured that the UE does not perform measurement on the entire system bandwidth when performing downlink CQI measurement.
  • the UE when performing downlink CQI measurement, does not treat an uplink signal sent by another UE to the base station as an interference signal to a downlink signal sent by the base station to the UE, thereby improving accuracy of downlink CQI measurement performed by the UE.
  • the accuracy of downlink CQI measurement performed by first UE can be improved, it can be ensured that the base station performs more accurate downlink channel quality estimation, so that the UE can obtain a proper downlink resource allocated to the UE by the base station.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the described apparatus embodiments are merely examples.
  • the module or unit division is merely logical function division and may be other division in actual implementation.
  • a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed.
  • the displayed or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections through some interfaces, apparatuses or units.
  • the units described as separate parts may or may not be physically separate. Parts displayed as units may or may not be physical units, and may be located in one position or distributed on a plurality of network units. Some or all of the units may be selected depending on actual requirements to achieve the objectives of the solutions of the embodiments.
  • functional units in the embodiments of this application may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.
  • the integrated unit may be implemented in a form of a software function unit.
  • the integrated unit When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on such an understanding, all or some of the technical solutions may be implemented in a form of a software product.
  • the software product is stored in a storage medium, and includes several instructions for instructing a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or some of the steps of the method described in the embodiments of this application.
  • the storage medium is a non-transitory (non-transitory) medium, and includes any medium that can store program code, such as a flash memory, a removable hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disc.

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  • Mobile Radio Communication Systems (AREA)

Claims (14)

  1. Procédé de mesure d'indicateur de qualité de canal (CQI), comprenant les étapes consistant à :
    recevoir (S103), par un équipement d'utilisateur (UE), une information d'indication de ressource en provenance d'une station de base, l'information d'indication de ressource étant utilisée pour indiquer une ressource de mesure de CQI en liaison descendante,
    la ressource de mesure de CQI en liaison descendante étant une ressource dans une ressource de système autre qu'une ressource en liaison montante pour un autre UE, l'UE et l'autre UE étant l'un et l'autre desservis par la station de base, et l'UE et l'autre UE appartenant à différents groupes d'UE ; et
    la ressource de mesure de CQI en liaison descendante comprenant une ressource de domaine fréquentiel, et une bande passante de la ressource de domaine fréquentiel étant inférieure à une bande passante de système ; et
    réaliser (S104), par l'UE, une mesure de CQI en liaison descendante sur la ressource de mesure de CQI en liaison descendante.
  2. Procédé de mesure de CQI selon la revendication 1, dans lequel la ressource de domaine fréquentiel comprend un ensemble de sous-bandes à mesurer et l'ensemble de sous-bandes à mesurer comprend au moins une sous-bande à mesurer ; et
    la réalisation, par l'UE, d'une mesure de CQI en liaison descendante sur la ressource de mesure de CQI en liaison descendante comprenant l'étape consistant à :
    réaliser, par l'UE, une mesure de CQI en liaison descendante sur l'au moins une sous-bande à mesurer.
  3. Procédé de mesure de CQI selon la revendication 2, dans lequel :
    l'information d'indication de ressource comprend un numéro de l'au moins une sous-bande à mesurer.
  4. Procédé de mesure de CQI selon la revendication 1, dans lequel la ressource de mesure de CQI en liaison descendante comprend en outre une ressource de domaine temporel, la ressource de domaine fréquentiel comprend m ensembles de sous-bandes à mesurer, la ressource de domaine temporel comprend m fenêtres de temps à mesurer, les m ensembles de sous-bandes à mesurer sont en correspondance biunivoque avec les m fenêtres de temps à mesurer, chaque ensemble de sous-bandes à mesurer comprend au moins une sous-bande à mesurer et chaque fenêtre de temps à mesurer comprend au moins une sous-trame à mesurer, m étant un entier supérieur ou égal à 1 ; et
    la réalisation, par l'UE, d'une mesure de CQI en liaison descendante sur la ressource de mesure de CQI en liaison descendante comprenant l'étape consistant à :
    réaliser, par l'UE, une mesure de CQI en liaison descendante sur au moins une sous-bande à mesurer dans chaque ensemble de sous-bandes à mesurer et dans une fenêtre de temps à mesurer qui correspond à l'ensemble de sous-bandes à mesurer.
  5. Procédé de mesure de CQI selon la revendication 4, dans lequel :
    l'information d'indication de ressource comprend m ensembles de numéros de sous-bande, m numéros de sous-trame de départ et m sous-trames, il existe une correspondance biunivoque entre les m ensembles de numéros de sous-bandes, les m numéros de sous-trame de départ et les m sous-trames, chaque ensemble de numéros de sous-bande comprend un numéro d'au moins une sous-bande à mesurer dans un ensemble de sous-bandes à mesurer, et l'ensemble de sous-bandes à mesurer est un des m ensembles de sous-bandes à mesurer.
  6. Procédé de mesure de CQI selon l'une quelconque des revendications 1 à 5, le procédé comprenant en outre, après la réalisation, par l'UE, d'une mesure de CQI en liaison descendante sur la ressource de mesure de CQI en liaison descendante, l'étape consistant à :
    envoyer (S105), par l'UE à la station de base, un résultat de mesure de CQI en liaison descendante, le résultat de mesure de CQI en liaison descendante comprenant une première valeur de CQI mesurée par l'UE sur la ressource de mesure de CQI en liaison descendante.
  7. Procédé de mesure de CQI selon la revendication 6, dans lequel :
    le résultat de mesure de CQI en liaison descendante comprend en outre une première valeur de décalage et la première valeur de décalage est utilisée pour indiquer une différence entre une seconde valeur de CQI d'une sous-bande mesurée par l'UE et la première valeur de CQI.
  8. Procédé de mesure de CQI selon l'une quelconque des revendications 1 à 7, dans lequel la réalisation, par l'UE, d'une mesure de CQI en liaison descendante sur la ressource de mesure de CQI en liaison descendante comprend l'étape consistant à :
    réaliser, par l'UE, une mesure de CQI en liaison descendante sur la ressource de mesure de CQI en liaison descendante pendant une première période de temps, la première période de temps étant un cycle pour que l'UE signale à la station de base le résultat de mesure de CQI en liaison descendante d'une mesure de CQI en liaison descendante réalisée par l'UE ou bien la première période de temps allant d'une sous-trame où la station de base envoie, à l'UE, une instruction donnant l'ordre à l'UE de réaliser une mesure de CQI en liaison descendante à une sous-trame où l'UE signale à la station de base le résultat de mesure de CQI en liaison descendante.
  9. Procédé de mesure de CQI selon l'une quelconque des revendications 1 à 8, dans lequel la réception, par l'UE, d'une information d'indication de ressource en provenance d'une station de base comprend les étapes consistant à :
    recevoir, par l'UE en provenance de la station de base, un message de contrôle des ressources radio (RRC) ou une information de contrôle en liaison descendante (DCI), le message RRC ou la DCI comprenant l'information d'indication de ressource ; et
    obtenir, par l'UE, l'information d'indication de ressource sur la base du message RRC ou de la DCI.
  10. Station de base, comprenant :
    une unité de détermination (10), configurée pour déterminer une ressource de mesure de CQI en liaison descendante,
    la ressource de mesure de CQI en liaison descendante étant destinée à être utilisée par un premier équipement d'utilisateur (UE) pour réaliser une mesure de CQI en liaison descendante, la ressource de mesure de CQI en liaison descendante comprenant une ressource de domaine fréquentiel, et une bande passante de la ressource de domaine fréquentiel étant inférieure à une bande passante de système ; et
    l'unité de détermination étant spécifiquement configurée pour déterminer la ressource de mesure de CQI en liaison descendante à partir d'une ressource de système sur la base d'une ressource en liaison montante affectée à un second UE par la station de base, la ressource de mesure de CQI en liaison descendante étant une ressource dans la ressource de système autre que la ressource en liaison montante pour le second UE, le premier UE et le second UE étant l'un et l'autre desservis par la station de base, et le premier UE et le second UE appartenant à différents groupes d'UE ; et
    une unité d'envoi (11), configurée pour envoyer une information d'indication de ressource au premier UE, l'information d'indication de ressource étant utilisée pour indiquer la ressource de mesure de CQI en liaison descendante déterminée par l'unité de détermination.
  11. Station de base selon la revendication 10, dans laquelle :
    la ressource de domaine fréquentiel comprend un ensemble de sous-bandes à mesurer et l'ensemble de sous-bandes à mesurer comprend au moins une sous-bande à mesurer.
  12. Station de base selon la revendication 11, dans laquelle :
    l'information d'indication de ressource comprend un numéro de l'au moins une sous-bande à mesurer.
  13. Station de base selon la revendication 10, dans laquelle la ressource de mesure de CQI en liaison descendante comprend en outre une ressource de domaine temporel ; et
    la ressource de domaine fréquentiel comprend m ensembles de sous-bandes à mesurer, la ressource de domaine temporel comprend m fenêtres de temps à mesurer, les m ensembles de sous-bandes à mesurer sont en correspondance biunivoque avec les m fenêtres de temps à mesurer, chaque ensemble de sous-bandes à mesurer comprend au moins une sous-bande à mesurer et chaque fenêtre de temps à mesurer comprend au moins une sous-trame à mesurer, m étant un entier supérieur ou égal à 1.
  14. Support de stockage lisible par ordinateur comprenant des instructions qui, lorsqu'elles sont exécutées par un ordinateur, amènent l'ordinateur à réaliser le procédé selon l'une quelconque des revendications 1 à 9.
EP17805518.2A 2016-05-30 2017-03-21 Procédé de mesurage d'indicateur de qualité de canal (cqi), et dispositif et système de communication sans fil Active EP3451562B1 (fr)

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